Print in bold means character played a Major role

Total Appearances- 43

Italics mean Karen used mobility. Continue adding italics.

EpisodesEdit

Season 1Edit

1. Plankton! (debut)
2. F.U.N.

Season 2Edit

1. Imitation Krabs (voice only)
2. Welcome to the Chum Bucket

Season 3Edit

1. The Algae's Always Greener
2. Plankton's Army

Season 4Edit

1. Fear of a Krabby Patty (2 cameos)
2. Krabs vs. Plankton
3. Dunces & Dragons
4. Enemy In-Law
5. Best Frenemies

Season 5Edit

1. Friend or Foe
2. Krabs a la Mode
3. Bucket Sweet Bucket
4. Goo Goo Gas
5. Mermaid Man vs. SpongeBob
6. Banned in Bikini Bottom
7. Spy Buddies Only Heard

Season 6Edit

1. Krabby Road
2. Spongicus
3. Patty Caper
4. Plankton's Regular
5. The Krabby Kronicle (non-speaking cameo)
6. Komputer Overload
7. Single Cell Anniversary
8. Truth or Square
9. Chum Caverns

Season 7Edit

1. Tentacle Vision (non-speaking cameo)
2. Someone's in the Kitchen with Sandy
3. The Inside Job
4. Greasy Buffoons
5. SpongeBob's Last Stand
6. One Coarse Meal
7. Buried in Time
8. Shellback Shenanigans
9. Perfect Chemistry

Season 8Edit

1. Frozen Face-Off
2. Sweet and Sour Squid
3. Plankton's Good Eye
4. Walking the Plankton
5. Free Samples
6. For Here or to Go
7. Karen 2.0
8. Move It or Lose It
9. Chum Fricassee
10. It's a SpongeBob Christmas!   

Season 9Edit

1. Plankton's Pet
2. Evil Spatula
3. Jailbreak!

MoviesEdit

1. The SpongeBob SquarePants Movie (debut of mobility)